verifyPow function

void verifyPow()

Implementation

void verifyPow() {
  final x = Tensor.fill([1, 1], 0.0);
  x.data = [3.0];

  final loss = x.pow(2.0).sum(); // x^2
  loss.backward();

  final grads = x.grad;
  // d(x^2)/dx = 2x. For x=3, grad = 6.0
  bool ok = closeEnough(grads[0], 6.0);
  print("POW: ${ok ? '✅ PASS' : '❌ FAIL (Expected 6.0, got ${grads[0]})'}");
}